Familiar fellow's inherited title (4)

I believe the answer is:

bart

I'm a little stuck... Click here to teach me more about this clue!

'familiar' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for bart that I've seen before include "Small title-holder being a brat" , "Son in The Simpsons" , "Homer's son" , "Branch of Islam" .)

I've seen this clue in the Evening Standard.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.

Connecting...